What should be set for controls that need to pass values to a script during form construction?

To ensure that values are correctly passed to a script during form construction, it is essential to establish a mapping of controls. Mapping allows you to define how the data entered by users in the form is linked to the variables or parameters used in the script. By creating this connection, you ensure that when a user interacts with the form and submits data, the values they provide are effectively transmitted to the script, enabling it to process this data accurately.

This mapping process involves specifying which controls correspond to which data points in your script, ensuring that the flow of information is seamless. This is crucial for the functionality of complex forms where multiple user inputs may be required to drive scripts or workflows effectively. Without proper mapping, the values entered in the form could either not be recognized by the script or be misinterpreted, leading to errors in processing or unexpected outcomes.

Other choices focus on different aspects of form construction. Default values only pertain to initial data settings, properties of controls relate to the attributes of form elements but do not handle data transmission, and submission flags deal with the status of the form submission rather than managing the mapping of input data to scripts. Thus, the emphasis on mapping is what makes it the correct choice in this context.